public static function wp_locale_weekday( $weekday, $format = 'weekday' ) {
			$weekday = trim( $weekday );

			$valid_formats = array(
				'full',
				'weekday',
				'initial',
				'abbreviation',
				'abbrev',
				'abbr',
				'short',
			);

			// if there isn't a valid format, bail without providing a localized string
			if ( ! in_array( $format, $valid_formats ) ) {
				return $weekday;
			}

			if ( empty( self::$localized_weekdays ) ) {
				self::build_localized_weekdays();
			}

			// if the weekday isn't numeric, we need to convert to numeric in order to
			// leverage self::localized_weekdays
			if ( ! is_numeric( $weekday ) ) {
				$days_of_week = array(
					'Sun',
					'Mon',
					'Tue',
					'Wed',
					'Thu',
					'Fri',
					'Sat',
				);

				$day_index = array_search( ucwords( substr( $weekday, 0, 3 ) ), $days_of_week );

				if ( false === $day_index ) {
					return $weekday;
				}

				$weekday = $day_index;
			}

			switch ( $format ) {
				case 'initial':
					$type = 'initial';
					break;
				case 'abbreviation':
				case 'abbrev':
				case 'abbr':
				case 'short':
					$type = 'short';
					break;
				case 'weekday':
				case 'full':
				default:
					$type = 'full';
					break;
			}

			return self::$localized_weekdays[ $type ][ $weekday ];
		}